Existence of Solutions for a Four-Point Boundary Value Problem with a $p(t)$-Laplacian. Communications in Mathematical Research, [S. l.], v. 31, n. 1, p. 23–30, 2021. DOI: 10.13447/j.1674-5647.2015.01.03. Disponível em: https://global-sci.com/index.php/cmr/article/view/8833. Acesso em: 5 dec. 2025.